Masks are not worn on the forehead, right?

Greek text has:

16καὶ ποιεῖ πάντας, τοὺς μικροὺς καὶ τοὺς μεγάλους, καὶ τοὺς πλουσίους καὶ τοὺς πτωχούς, καὶ τοὺς ἐλευθέρους καὶ τοὺς δούλους, ἵνα δῶσιν αὐτοῖς χάραγμα ἐπὶ τῆς χειρὸς αὐτῶν τῆς δεξιᾶς ἢ ἐπὶ τὸ μέτωπον αὐτῶν
ΑΠΟΚΑΛΥΨΙΣ ΙΩΑΝΝΟΥ 13

What does ἐπὶ τὸ μέτωπον mean, literally?

Here is from the oldest form of Greek that's traditionally taught and not reconstructed:

μέτ-ωπον (ὤψ): forehead, also front of a helmet, Il. 16.70.
Georg Autenrieth. A Homeric Dictionary for Schools and Colleges. New York. Harper and Brothers. 1891.

For those who would argue, this is not the mark, which for the sake of some I love I hope they are right, one could argue it is not physically a "χάραγμα". But does it become a mental one?/HGL